modlib/minetest/schematic.lua

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schematic = {}
local metatable = {__index = schematic}
function schematic.setmetatable(self)
return setmetatable(self, metatable)
end
function schematic.create(self, pos_min, pos_max)
self.size = vector.subtract(pos_max, pos_min)
local voxelmanip = minetest.get_voxel_manip(pos_min, pos_max)
local emin, emax = voxelmanip:read_from_map(pos_min, pos_max)
local voxelarea = VoxelArea:new{ MinEdge = emin, MaxEdge = emax }
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local nodes, light_values, param2s = {}, self.light_values and {}, {}
local vm_nodes, vm_light_values, vm_param2s = voxelmanip:get_data(), light_values and voxelmanip:get_light_data(), voxelmanip:get_param2_data()
local node_names, node_ids = {}, {}
local i = 0
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for index in voxelarea:iterp(pos_min, pos_max) do
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if nodes[index] == minetest.CONTENT_UNKNOWN or nodes[index] == minetest.CONTENT_IGNORE then
error("unknown or ignore node at " .. minetest.pos_to_string(voxelarea:position(index)))
end
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local name = minetest.get_name_from_content_id(vm_nodes[index])
local id = node_ids[name]
if not id then
table.insert(node_names, name)
id = #node_names
node_ids[name] = id
end
i = i + 1
nodes[i] = id
if self.light_values then
light_values[i] = vm_light_values[index]
end
param2s[i] = vm_param2s[index]
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end
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local metas = self.metas
if metas or metas == nil then
local indexing = vector.add(self.size, 1)
metas = {}
for _, pos in ipairs(minetest.find_nodes_with_meta(pos_min, pos_max)) do
local meta = minetest.get_meta(pos):to_table()
if next(meta.fields) ~= nil or next(meta.inventory) ~= nil then
local relative = vector.subtract(pos, pos_min)
metas[((relative.z * indexing.y) + relative.y) * indexing.x + relative.x] = meta
end
end
end
self.node_names = node_names
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self.nodes = nodes
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self.light_values = light_values
self.param2s = param2s
self.metas = metas
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return schematic.setmetatable(self)
end
function schematic:write_to_voxelmanip(voxelmanip, pos_min)
local pos_max = vector.add(pos_min, self.size)
local emin, emax = voxelmanip:read_from_map(pos_min, pos_max)
local voxelarea = VoxelArea:new{ MinEdge = emin, MaxEdge = emax }
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local nodes, light_values, param2s, metas = self.nodes, self.light_values, self.param2s, self.metas
local vm_nodes, vm_lights, vm_param2s = voxelmanip:get_data(), light_values and voxelmanip:get_light_data(), voxelmanip:get_param2_data()
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for _, pos in ipairs(minetest.find_nodes_with_meta(pos_min, pos_max)) do
-- Clear all metadata. Due to an engine bug, nodes will actually have empty metadata.
minetest.get_meta(pos):from_table{}
end
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local content_ids = {}
for index, name in ipairs(self.node_names) do
content_ids[index] = assert(minetest.get_content_id(name), ("unknown node %q"):format(name))
end
local i = 0
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for index in voxelarea:iterp(pos_min, pos_max) do
i = i + 1
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vm_nodes[index] = content_ids[nodes[i]]
if light_values then
vm_lights[index] = light_values[i]
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end
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vm_param2s[index] = param2s[i]
end
voxelmanip:set_data(vm_nodes)
if light_values then
voxelmanip:set_light_data(vm_lights)
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end
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voxelmanip:set_param2_data(vm_param2s)
if metas then
local indexing = vector.add(self.size, 1)
for index, meta in pairs(metas) do
local floored = math.floor(index / indexing.x)
local relative = {
x = index % indexing.x,
y = floored % indexing.y,
z = math.floor(floored / indexing.y)
}
minetest.get_meta(vector.add(relative, pos_min)):from_table(meta)
end
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end
end
function schematic:place(pos_min)
local pos_max = vector.add(pos_min, self.size)
local voxelmanip = minetest.get_voxel_manip(pos_min, pos_max)
self:write_to_voxelmanip(voxelmanip, pos_min)
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voxelmanip:write_to_map(not self.light_values)
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return voxelmanip
end
function schematic:write_bluon(path)
local file = io.open(path, "w")
-- Header, short for "ModLib Bluon Schematic"
file:write"MLBS"
modlib.bluon:write(self, file)
file:close()
end
function schematic.read_bluon(path)
local file = io.open(path, "r")
assert(file:read(4) == "MLBS", "not a modlib bluon schematic")
local self = modlib.bluon:read(file)
assert(not file:read(), "expected EOF")
return schematic.setmetatable(self)
end
function schematic:write_zlib_bluon(path, compression)
local file = io.open(path, "w")
-- Header, short for "ModLib Zlib-compressed-bluon Schematic"
file:write"MLZS"
local rope = modlib.table.rope{}
modlib.bluon:write(self, rope)
local text = rope:to_text()
file:write(minetest.compress(text, "deflate", compression or 9))
file:close()
end
function schematic.read_zlib_bluon(path)
local file = io.open(path, "r")
assert(file:read(4) == "MLZS", "not a modlib zlib compressed bluon schematic")
local self = modlib.bluon:read(modlib.text.inputstream(minetest.decompress(file:read"*a", "deflate")))
return schematic.setmetatable(self)
end